J/AJ/149/149ivo://CDS.VizieR/J/AJ/149/149doi:10.26093/cds/vizier.51490149CDSBakos G.A.Hartman J.D.Bhatti W.Bieryla A.de Val-Borro M.,Latham D.W.Buchhave L.A.Csubry Z.Penev K.Kovacs G.Beky B.,Falco E.Kovacs T.Howard A.W.Johnson J.A.Isaacson H.Marcy G.W.,Torres G.Noyes R.W.Berlind P.Calkins M.L.Esquerdo G.A.Lazar J.,Papp I.Sari P.2017-06-29T08:55:50Z2015-05-12T14:01:40ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frsolar-system-planetsmultiple-starsk-starsphotometryradial-velocityWe report the discovery of HAT-P-54b, a planet transiting a late K dwarf star in field 0 of the NASA K2 mission. We combine ground-based photometric light curves with radial velocity measurements to determine the physical parameters of the system. HAT-P-54b has a mass of 0.760+/0.032M_J_, a radius of 0.944+/-0.028R_J_, and an orbital period of 3.7998days. The star has V=13.505+/0.060, a mass of 0.645+/-0.020M_{sun}_, a radius of 0.617+/-0.013R_{sun}_, an effective temperature of T_eff*_=4390+/-50, and a subsolar metallicity of [Fe/H]=-0.127+/-0.080. We also detect a periodic signal with P=15.6days and 5.6mmag amplitude in the light curve, which we interpret as due to the rotation of the star. HAT-P-54b has a radius that is smaller than 92% of the known transiting planets with masses greater than that of Saturn, while HAT-P-54 is one of the lowest-mass stars known to host a hot Jupiter. Follow-up high-precision photometric observations by the K2 mission promise to make this a well-studied planetary system.2015AJ....149..149Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/149/149CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/AJ/147/84 : Photometry and spectroscopy of HAT-P-49 (Bieryla+, 2014)J/AJ/144/139 : HAT-P-39, HAT-P-40, and HAT-P-41 follow-up (Hartman+, 2012)J/ApJ/742/59 : HAT-P-32 and HAT-P-33 follow-up (Hartman+, 2011)J/ApJ/728/138 : Follow-up photometry of HAT-P-26 (Hartman+, 2011)J/ApJ/726/52 : HAT-P-18 and HAT-P-19 follow-up (Hartman+, 2011)J/ApJ/720/1118 : i-band photometry of HAT-P-16 (Buchhave+, 2010)J/ApJ/710/1724 : Follow-up photometry for HAT-P-11 (Bakos+, 2010)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/149/149https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/149/149http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/149/149https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/149/149https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/149/149http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/149/149GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/AJ/149/149/table1Differential photometry of HAT-P-54recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDUTC Barycentric Julian date (BJD-2400000) (G1)dtime.epochdoubleDmagDifferential observed magnitude in Flt (1)magphot.mag;arith.diffdoublee_DmagThe 1{sigma} uncertainty in magmagstat.error;phot.mag;arith.diffdoubleomag? Raw, observed magnitude (2)magphot.magdoublenullableFltFilter used in the observation (Sloan r or i)instr.setup;obscharInstInstrument used (HATNet or Keplercam) (3)instr.setupcharJ/AJ/149/149/table2Relative radial velocities, bisector span measurements, and stellar atmospheric parameters of HAT-P-54recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDUTC Barycentric Julian Date (BJD-2454000) (G1)dtime.epochdoublef_BJD[f] Indicates an I_2_-free template spectrum (1)meta.codecharRV? Radial velocity (2)m/sphys.veloc;pos.heliocentricfloatnullablee_RV? The 1{sigma} uncertainty in RV (3)m/sstat.errorfloatnullableBSBissector span measurementm/sphys.velocfloate_BSThe 1{sigma} uncertainty in BSm/sstat.errorfloatS/N? Signal-to-noise ratio per resolution element (SNRe)stat.snr;pos.angResolutionfloatnullableTeff? Stellar effective temperature (4)Kphys.temperature.effectiveintnullable[Fe/H]? Metallicity (4)log(Sun)phys.abund.Zfloatnullablevsini? Rotational velocity (4)km/sphys.veloc.rotatfloatnullablePhase[0/1] Phasetime.phasefloatInstInstrument (HIRES or TRES) (5)meta.id;instrchar